The easiest way is to use a web form to generate random integers (with duplicates, like dice rolls), randomized sequences (without duplicates, like lottery tickets) or raw random bytes. You can also flip virtual coins and generate random bitmaps.

Strolen:
No such thing as a "true random number." :)

MoonHunter:
True, but close enough for gaming purposes.

I mean every dice has different rolling characteristics. We all have had special dice that roll well in some direction.